Michael,

I think it is just a tour put together by a promoter with good taste. It is a small tour featuring the gentleman you mentioned above. No connection with the Rhino CD that I am aware of, except I think each artist happens to be on it.   Yes, they are indeed referring to Washington Square Park in Greenwich Village. Most of these artists have connections with the NYC folk scene of the early 60's, even Loudon. The tour is being billed as Washington Square Folk Festival. Sounds like fun.

Ron